What is the author’s purpose in this article? What evidence supports your claim about his purpose?

PLEASE PLEASE HELP ME ASAP

ps:im not really good at understanding history so please help me!!

Event : 1800s dual federalism / layer cake federalism effect on balance of power between local, state, and national governments : event : 1861-1865 civil war effect on balance of power between local, state, and national governments: event : 1933 new deal / cooperative federalism / marble cake federalism effect on balance of power between local, state, and national governments: event : 1964 start of great society effect on balance of power between local, state, and national governments: event : 1980s and 1990s new federalism devolution revolution effect on balance of power between local, state, and national governments: event : 2010 progressive federalism effect on balance of power between local, state, and national governments: